Preparation of 2,4,6-triisopropylphenol
US4275248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1980 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Apr 9, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for introducing a plurality of alkyl groups into the aromatic ring of a hydroxy-substituted aromatic compound, whereby the available ortho sites are completely alkylated, comprises contacting said aromatic compound with olefin in the presence of a fluorided alumina as catalyst and recovering the product. The products of the process of this invention possess substantial antioxidant properties. A particular composition which shows enhanced resistance to oxidation and lowered gum formation comprises a major amount of a liquid petroleum product and from about 5 to about 500 parts per million by weight of a polyisopropyl hydroxy aromatic compound in which the available ortho positions are alkylated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.